JPS61257503A - Soil type paving material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an earth-based pavement material, and particularly to an earth-based pavement material whose base materials are clayey soil and tuffaceous stone powder.

[Conventional technology]

Recently, not only roads in subcommittees but also playgrounds are being paved with asphalt, cement concrete, etc., and contact between people and soil has been eliminated. When building sidewalks, plazas, etc. using clay soil such as Kanto loam, it provides a comfortable walking feeling due to its elasticity and cushioning properties, as well as a sense of unity with the earth, but on the other hand, it inevitably lacks durability. . In other words, the upper space is always subject to the harsh effects of nature, so for example, when it rains, it absorbs water and becomes soft, or when it dries, the water evaporates, causing cracks and dust. In addition, its use is severely restricted in winter due to frost damage. For this reason, generally, Arakida is added to the soil and mixed, and bittern or lithium chloride is sprinkled on the soil, but it is quickly washed away by rainwater.

[Problem that the invention seeks to solve]

As mentioned above, the number of earthen sidewalks and playgrounds is decreasing, so soil is being reconsidered, and from the standpoint of preserving the natural environment and managing human health, more walking paths and playgrounds are being built. There is a trend towards naturalization. However, there were problems with the soil, such as the soil getting muddy when it rained, and dust forming when it dried, and even when conventional soil conditioners were added, they were not as effective due to the moisture in the soil.

[Means for solving problems]

The present invention solves the above problems, takes advantage of the characteristics of natural soil, and
It was developed with the aim of providing a soil-based paving material that does not become muddy with water, does not generate dust even when dry, and can withstand human loads. An earth-based paving material characterized by using stone powder as a base material and mixing it with cement and rubber latex.

(2) For the base material, tuffaceous stone powder is added at a ratio of 20% to 150% by volume per 1 unit volume part of clayey soil, and the cement is added at a rate of 100 kg to 250 kg per 1 cubic meter of the base material.
The rubber latex is added in a solid content range of 0 to 30% of the weight of the cement and is kneaded together.
Earth-based pavement materials listed in section.

(3) The soil-based paving material according to claim 1, wherein the clayey soil is Kanto loam, the tuffaceous stone powder is Oya stone cutting powder, and the cement is ordinary Portland cement. Configured.

[For production]

According to the present invention having the above configuration, first, since the base material is a mixture of clayey soil such as Kanto loam and tuffaceous stone powder such as Oya stone, it is improved to a sandy loam.

Cement and rubber latex are added to this base material, and the cement binds the soil particles and stone powder of the base material, prevents flow and scattering, and provides water permeability. Rubber latex hardens and bonds neighboring particles to form coarse particles, so it can withstand heavy rainwater easily! :<<, effective in preventing cracks caused by drying.

〔Example〕

Examples of the present invention will be described in detail. First, as a first example, 0.5 rrr of clayey soil (Kanto loam) extracted by excavating the road surface for sewerage construction in Nerima Ward, Tokyo was used at the Oya Stone Quarry in Oya Town, Utsunomiya City, Tochigi Prefecture. Oya stone powder (tuff stone powder) that was discarded during Oya stone quarrying with a particle size of 0.01~
0,5 n of crushed to 1.511? Thoroughly stir and mix with a mixer to create a base material, and separately mix 200 kg of ordinary Portland cement and 40 kg of rubber latex (polychloroprene rubber) with a mixer to make an additive, and add this additive to the base material. The mixture was thoroughly stirred and mixed using a mixer to produce an earth-based paving material. The composition characteristics of the base material are shown in Table-1.

Table-1 (Example of clayey soil: tuffaceous stone powder = 1:1) This table-
As shown in 1, the earth-based pavement material according to the present invention has a continuous particle size, and is a material that has a high compaction effect and is easy to obtain workability. In addition, the addition of tuffaceous stone powder has modified the clay soil into sandy loam.

Furthermore, when compared with clayey soils such as Kanto loam or Arakida, to which crushed stone and crushed stone dust are added, the soil-based paving material according to the present invention has tuff itself that is harder than crushed stone (and is less compatible with clayey soil). It has the characteristic that it mixes very well and without any discomfort.

Figure 1 is a cross-sectional view of the test construction. A trench 2 with a depth of 10 m (width: 2 m, length: 10 m) is dug on the factory site road 1, and the soil-based paving material 3 is leveled on the natural soil surface in this trench 2 to a thickness of 5 cm using manual labor and a small bulldozer. After curing for 3 days, 5 kg of water per 1 day was sprinkled with a sprayer and visually observed, and it was found that the water drainage was very good and there was no stickiness. .

When a separate water permeability test was conducted, the result was 4-6 x 10-'c.
ra/sec was obtained.

Furthermore, a 20-point broctor needle penetration resistance test was conducted and a comparison with the expected value of a conventional soil ground is shown in Table 2.

As shown in Table 2, the soil-based pavement material according to the present invention has appropriate hardness even when people walk and run on it, and unlike asphalt concrete pavement or cement concrete pavement, it is similar to natural soil. The penetration resistance value is
It can be said that there is no adverse effect on humans.

Table 2 An enlarged view of the soil-based pavement material constructed above is shown in Figure 2. As shown in FIG. 2, the rubber latex 7 has clay particles 5 and tuff stone powder particles 6 connected in a rubber paste-like manner, and the connections are made in a large coarse state or in a spongy manner. The material itself has rubber-like elasticity and is highly flexible. Moreover, the cement 8 strengthens the bonding of each particle as a whole and enhances the effect of preventing flow due to water.

Table 32 Table 4 is a graph plotting the unconfined compressive strength and strain of the earth-based pavement materials for each formulation. This table-
In Table 31-4, the black mark indicates the loam alone, and the open mark indicates the base material according to the present invention, which is a mixture of loam and tuffaceous stone powder. As is clear from this table, the earth-based paving material according to the present invention can obtain strength according to its use and purpose, and also with respect to strain, the rubber latex reacts with cement and the soil particles are wrapped in a rubber film. 9 elasticity, sticky and granular! Because it is water-based, it is characterized by greater strain than products that do not contain rubber latex.

In addition, the soil-based paving material according to the present invention uses Okamaishi powder, and since this stone powder has an angular particle shape, it is compatible with sticky soil such as Kanto loam, and due to the effect of additives, it is less susceptible to softening due to rain. It has the feature that it can be used immediately after a heavy rain. Furthermore, because it has a natural, non-artificial color, it blends well with the surrounding natural environment and does not spoil the landscape, and there is no risk of cracking or dusting even when it dries.

The above base material composition was a 1:1 ratio of clayey soil and tuffaceous stone powder, but good results were obtained experimentally using this in the range of 1'OO:20 parts to 100:150 parts. got 6
From Table 3, it can be seen that preferably 100:50 to 100 parts is highly effective.

In addition, the addition ratio of cement and rubber latex to the base material is 100 kg/rrr to 250 kg in the case of cement.
It is preferable to add in a range of g/rrr. This shall be changed as appropriate depending on the location conditions such as dry land or wetland and the usage conditions.

The rubber latex is added in an amount of 0 to 30% by weight of the cement, preferably 15 to 25% by weight.

Although polychloroprene rubber was used as the rubber latex in the examples, the application of the present invention is not limited to this polychloroprene rubber, and any rubber latex may be used as long as it can be added to cement to improve the properties of the mixture. For example, raw rubber, SBR (styrene, butadiene), NBR (acrylonitrile butadiene) and CR (chloroprene)
It is also possible to use latex.

For construction, use known machinery and materials to level the ground, compact it by rolling, and for curing, sprinkle sand etc., then water, and cover with curing mats etc. as necessary.

〔effect〕

(a) As described above, the present invention can utilize tuffaceous stone powder such as Okamaite stone powder, which has no way of being reused as waste.

(El) Since tuff powder is mixed with clayey soil, the roadbed soil at the construction site can be used as is and modified in areas such as the Kanto loam zone.

(c) Since liquid rubber latex is used, due to its synergistic effect with cement, there is less softening due to rain, drainage after rain is good, and no cracks occur due to drying.

(d) It has a natural, non-artificial color that matches the surrounding natural environment.

(*) Unlike cement concrete or asphalt concrete, it uses natural soil and stone, so it has a suitable hardness for walking and running, and has no negative impact on people. It has many excellent effects.

[Brief explanation of the drawing]

The drawings relate to the present invention, and Figure 1 is a construction cross-sectional view of earth-based pavement;
Figure 2 is a partially enlarged view of soil-based pavement materials. ■...Road 2...Groove 3...Earth-based paving material 4...Small vibrating roller 5
...Soil particles 6...Stone powder particles 7...Liquid rubber latex Table-3 Tuff stone powder mixing ratio (χ) for 100 clayey soil Table-4

Claims (3)

[Claims] (1) An earth-based paving material characterized by having clay soil and tuffaceous stone powder as a base material, and adding and mixing cement and rubber latex to the base material. (2) For the base material, tuffaceous stone powder is added at a ratio of 20% to 150% by volume to 1 unit volume part of clayey soil, and the cement is 100 kg to 250 kg per 1 cubic meter of the base material.
The soil system according to claim 1, characterized in that the rubber latex is added in a solid content range of 0 to 30% by weight of the cement weight and is kneaded together. paving material. (3) The first claim characterized in that the clayey soil is Kanto loam, the tuffaceous stone powder is Oya stone cutting powder, and the cement is ordinary Portland cement.
Earth-based pavement materials listed in section.